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powerpc/booke: Use a pseudo-DMAP for the device mappings on booke64

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Since powerpc64 has such a large virtual address space, significantly larger
than its physical address space, take advantage of this, and create yet
another DMAP-like instance for the device mappings.  In this case, the
device mapping "DMAP" is in the 0x8000000000000000 - 0xc000000000000000
range, so as not to overlap the physical memory DMAP.

This will allow us to add TLB1 entry coalescing in the future, especially
useful for things like the radeonkms driver, which maps parts of the GPU at
a time, but eventually maps all of it, using up a lot of TLB1 entries (~40).
This commit is contained in:
jhibbits 2020-02-25 01:40:22 +00:00
parent fd4d4b2d44
commit c62f205818
1 changed files with 26 additions and 13 deletions
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39
sys/powerpc/booke/pmap.c
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@ -221,7 +221,22 @@ uint32_t tlb1_entries;
#define TLB1_ENTRIES (tlb1_entries)
static vm_offset_t tlb1_map_base = (vm_offset_t)VM_MAXUSER_ADDRESS + PAGE_SIZE;
/*
* Base of the pmap_mapdev() region. On 32-bit it immediately follows the
* userspace address range. On On 64-bit it's far above, at (1 << 63), and
* ranges up to the DMAP, giving 62 bits of PA allowed. This is far larger than
* the widest Book-E address bus, the e6500 has a 40-bit PA space. This allows
* us to map akin to the DMAP, with addresses identical to the PA, offset by the
* base.
*/
#ifdef __powerpc64__
#define VM_MAPDEV_BASE 0x8000000000000000
#define VM_MAPDEV_PA_MAX 0x4000000000000000 /* Don't encroach on DMAP */
#else
#define VM_MAPDEV_BASE (VM_MAXUSER_ADDRESS + PAGE_SIZE)
#endif
static vm_offset_t tlb1_map_base = VM_MAPDEV_BASE;
static tlbtid_t tid_alloc(struct pmap *);
static void tid_flush(tlbtid_t tid);
@ -3475,8 +3490,10 @@ mmu_booke_mapdev_attr(mmu_t mmu, vm_paddr_t pa, vm_size_t size, vm_memattr_t ma)
{
tlb_entry_t e;
vm_paddr_t tmppa;
void *res;
uintptr_t va, tmpva;
#ifndef __powerpc64__
uintptr_t tmpva;
#endif
uintptr_t va;
vm_size_t sz;
int i;
int wimge;
@ -3512,6 +3529,11 @@ mmu_booke_mapdev_attr(mmu_t mmu, vm_paddr_t pa, vm_size_t size, vm_memattr_t ma)
size = roundup(size, PAGE_SIZE);
#ifdef __powerpc64__
KASSERT(pa < VM_MAPDEV_PA_MAX,
("Unsupported physical address! %lx", pa));
va = VM_MAPDEV_BASE + pa;
#else
/*
* The device mapping area is between VM_MAXUSER_ADDRESS and
* VM_MIN_KERNEL_ADDRESS. This gives 1GB of device addressing.
@ -3534,24 +3556,15 @@ mmu_booke_mapdev_attr(mmu_t mmu, vm_paddr_t pa, vm_size_t size, vm_memattr_t ma)
sz = ffsl((~((1 << flsl(size-1)) - 1)) & pa);
sz = sz ? min(roundup(sz + 3, 4), flsl(size) - 1) : flsl(size) - 1;
va = roundup(tlb1_map_base, 1 << sz) | (((1 << sz) - 1) & pa);
#ifdef __powerpc64__
} while (!atomic_cmpset_long(&tlb1_map_base, tmpva, va + size));
#else
} while (!atomic_cmpset_int(&tlb1_map_base, tmpva, va + size));
#endif
#else
#ifdef __powerpc64__
va = atomic_fetchadd_long(&tlb1_map_base, size);
#else
va = atomic_fetchadd_int(&tlb1_map_base, size);
#endif
#endif
res = (void *)va;
if (tlb1_mapin_region(va, pa, size, tlb_calc_wimg(pa, ma)) != size)
return (NULL);
return (res);
return ((void *)va);
}
/*